Provides enumerated values to use to set regular expression options.
This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values.
Assembly: System (in System.dll)
|Specifies that the regular expression is compiled to an assembly. This yields faster execution but increases startup time. This value should not be assigned to the Options property when calling the CompileToAssembly method.|
|Specifies that cultural differences in language is ignored. See Regular Expression Options for more information.|
|Enables ECMAScript-compliant behavior for the expression. This value can be used only in conjunction with the , , and values. The use of this value with any other values results in an exception.|
|Specifies that the only valid captures are explicitly named or numbered groups of the form (?<name>…). This allows unnamed parentheses to act as noncapturing groups without the syntactic clumsiness of the expression (?:…).|
|Specifies case-insensitive matching.|
|Eliminates unescaped white space from the pattern and enables comments marked with #. However, the value does not affect or eliminate white space in character classes.|
|Multiline mode. Changes the meaning of ^ and $ so they match at the beginning and end, respectively, of any line, and not just the beginning and end of the entire string.|
|Specifies that no options are set.|
|Specifies that the search will be from right to left instead of from left to right.|
|Specifies single-line mode. Changes the meaning of the dot (.) so it matches every character (instead of every character except \n).|
A value can be provided as a parameter to the following members of the Regex class:
The Regex::Regex(String, RegexOptions) class constructor.
The Regex::Split(String, String, RegexOptions) method.
The Regex::IsMatch(String, String, RegexOptions) method.
The Regex::Match(String, String, RegexOptions) method.
The Regex::Matches(String, String, RegexOptions) method.
A value can also be supplied as a parameter to the RegexCompilationInfo constructor, or it can be assigned directly to the Options property. The resulting RegexCompilationInfo object is then used in the call to the CompileToAssembly method.
Several options provided by members of the enumeration (in particular, by its , , , and members) can instead be provided by using an inline option character in the regular expression pattern. For details, see Regular Expression Options.
The following example defines two regular expressions that identify repeated words in text but that are instantiated using different values. The first regular expression is case-insensitive; case is ignored when determining whether a word is identical to the preceding word. The second regular expression is case-sensitive; a word must match the case of the preceding word exactly to be considered a duplicate.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.